registry team mailing list archive

[Michael Loftis <608988@xxxxxxxxxxxxxxxxxx>]

--On Friday, July 23, 2010 3:06 AM +0000 Joshua McKenty 
<jmckenty@xxxxxxxxx> wrote:

> As long as we keep in mind that we want to support multiple image
> stores, and fall back to a more pathetic transfer method if needed.
>
> Also that we'll be transferring OVF files (which could be bittorrent
> packed).
>
> I'm still inclined to favor multicast over bittorrent, at least when the
> image store is on the LAN.

Multicast has so many other issues though for this sort of thing. Like 
you're limited to the speed of the slowest client (or else this one slow 
client will cause a huge number of repeat/retry requests), and even then, 
you need to have a 'repeat' mechanism for missed data.

BT-like (A->B B->C B->D ...) and ring-like ( A->B B->C C->D ) approaches 
where peers share or forward are much more effective and efficient at 
duplicating data across a cloud without adding excessive complexity of 
multicast schemes.

-- 
checksum images before booting
https://bugs.launchpad.net/bugs/608988
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